[jira] [Created] (DBCP-412) dbcp2.PoolableConnection.close raises NullPointerException

[Davide Caroselli (JIRA)]

Davide Caroselli created DBCP-412:
-------------------------------------

             Summary: dbcp2.PoolableConnection.close raises NullPointerException
                 Key: DBCP-412
                 URL: https://issues.apache.org/jira/browse/DBCP-412
             Project: Commons Dbcp
          Issue Type: Bug
    Affects Versions: 2.0
         Environment: Mac OSX, Java 7, SQLAzure
            Reporter: Davide Caroselli
            Priority: Critical


I found a critical error while closing a PoolableConnection.
Here's the code to reproduce the bug (largely copied from the example shown in 
the Apache DBCP site):

{code:title=PoolingDataSourceExample2.java|borderStyle=solid}
public static void main(String[] args) throws Throwable {
    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
    DataSource dataSource = setupDataSource(jdbcUrl);

    Connection connection = null;
    PreparedStatement statement = null;
    ResultSet result = null;

    try {
        connection = dataSource.getConnection();
        statement = connection.prepareStatement("SELECT 1");
        result = statement.executeQuery();
    } finally {
        result.close();
        statement.close();
        connection.close();
    }
}

public static DataSource setupDataSource(String connectURI) {
    ConnectionFactory connectionFactory = new 
DriverManagerConnectionFactory(connectURI, null);
    PoolableConnectionFactory poolableConnectionFactory = new 
PoolableConnectionFactory(connectionFactory, null);
    ObjectPool<PoolableConnection> connectionPool = new 
GenericObjectPool<>(poolableConnectionFactory);
    PoolingDataSource<PoolableConnection> dataSource = new 
PoolingDataSource<>(connectionPool);

    return dataSource;
}
{code}

When the code tries to close the connection (in the final block), an exception 
is raised:
{code:title=PoolingDataSourceExample2.java|borderStyle=solid}
Exception in thread "main" java.lang.NullPointerException
        at 
org.apache.commons.dbcp2.PoolableConnection.close(PoolableConnection.java:151)
        at 
org.apache.commons.dbcp2.DelegatingConnection.closeInternal(DelegatingConnection.java:235)
        at 
org.apache.commons.dbcp2.DelegatingConnection.close(DelegatingConnection.java:218)
        at 
org.apache.commons.dbcp2.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:212)
        at 
dbcp.PoolingDataSourceExample2.closeQuietly(PoolingDataSourceExample2.java:64)
        at 
dbcp.PoolingDataSourceExample2.main(PoolingDataSourceExample2.java:43){code}

As I can see, the problem is the "_pool" variable inside PoolableConnection but 
I could not find any solution.



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